It is not easy to power the PI4 and a touch screen from a battery but this was ideal for my portable Youtube video jukebox. It will run for up to 2 hours on one charge. There is a standby on/off switch to turn the battery off completely. One-touch to turn on, two touches for off. Fast charge. It is not intended as a UPS as it will briefly turn the Pi off when you plug it in as it switches to charging mode, but if it is fully charged you can always plug into the PI to save battery and remove the power with no interruption. Good value with through GPIO pins for easy stacking see photo